It’s made from source code, and is thus that minimal — just over 200 MB. You may find some icons and widgets are still dressed up with old look, which it seems is because Google is yet to update Android 6.0 source code fully. Anyway, if you are fan of AOSP ROMs, this is for you.

Also this comes without gapps, so you will need to flash Gapps too. Right now, Marshmallow Gapps aren’t available, so try your luck with the Android 5.1 Gapps here.

That’s it.

Nexus 6

Nexus 6 Marshmallow Radio and bootloader

To be added later, as and when it becomes available.

Nexus 6 Marshmallow ROMs

To be added later, as and when it becomes available.

→ We will add more ROMs for Nexus 5, Nexus 6 and other devices as and when they become available. Keep watching this space.

How to install Marshmallow custom ROMs

→ Make sure you uninstall Xposed framework (if you have it) before installing the ROM.

Step 1.Download the custom ROM file and the bootloader+radio file from above. Be sure to download the one meant for your device.

Also, it’s important you have the Marshmallow radio and bootloader installed before flashing the Marshmallow ROM.

Also, for AOSP ROMs, you need to download Gapps file too, which has been linked above. Be sure to flash the Gapps file after flashing the ROM in step 6 below.

Step 4. Boot your device into recovery mode. Once you see TWRP, you are good to go to next step. (If you are rooted, you can use Quick Boot app from play store.)

→ Tip: Once you boot into TWRP, create a backup so that if anything goes wrong, you can restore this backup to fix your device.

Step 5. In TWRP recovery, tap on Install > locate the radio+bootloader file and tap on it. Then do the Swipe action at bottom to begin flashing the Marshmallow radio and bootloader.

Step 6. Tap on Home button at bottom left of the screen. Then tap on Install > now locate the Marshmallow ROM file and tap on it. Then do the Swipe action at bottom to begin flashing the Marshmallow update. Wait for the ROM to install.

→ If you are installing an AOSP ROM, then be sure to flash the Gapps file after above is done. Otherwise, ignore this.